National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Decatur Airport (KDEC)

Lat: 39.83°NLon: 88.87°WElev: 670ft.

Fair

45°F

7°C

Humidity 74%
Wind Speed S 14 mph
Barometer 29.89 in (1012.3 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill39°F (4°C)
Last update 8 Jan 1:54 am CST
Extended Forecast for

Decatur Airport IL

  • Overnight

    Overnight: Mostly cloudy, with a low around 41. South southeast wind 10 to 13 mph, with gusts as high as 21 mph.

    Low: 41 °F

    Mostly Cloudy

  • Thursday

    Thursday: Rain, mainly after 11am. Patchy fog between 8am and 11am. High near 63. Breezy, with a south southeast wind 13 to 22 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Chance Rain
    and Patchy
    Fog then Rain
    and Breezy

  • Thursday Night

    Thursday Night: Rain and thunderstorms before 3am, then a slight chance of rain. Some of the storms could produce heavy rainfall. Low around 47. Breezy, with a south wind 20 to 25 mph becoming west southwest after midnight. Winds could gust as high as 39 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    Low: 47 °F

    Breezy. Heavy
    Rain then
    Chance Rain

  • Friday

    Friday: Mostly cloudy, with a high near 50. Breezy, with a west wind 15 to 20 mph becoming north 8 to 13 mph in the afternoon. Winds could gust as high as 29 mph.

    High: 50 °F

    Mostly Cloudy
    and Breezy
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Northeast wind around 7 mph.

    Low: 35 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: A 40 percent chance of rain before noon. Partly sunny, with a high near 42. Breezy, with a west wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph.

    High: 42 °F

    Chance Rain
    then Partly
    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 21. Blustery, with a west wind 16 to 21 mph, with gusts as high as 28 mph.

    Low: 21 °F

    Partly Cloudy
    then Mostly
    Cloudy and
    Blustery

  • Sunday

    Sunday: Partly sunny, with a high near 31. Blustery.

    High: 31 °F

    Partly Sunny
    and Blustery
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 22.

    Low: 22 °F

    Mostly Clear

Detailed Forecast

Overnight
Mostly cloudy, with a low around 41. South southeast wind 10 to 13 mph, with gusts as high as 21 mph.
Thursday
Rain, mainly after 11am. Patchy fog between 8am and 11am. High near 63. Breezy, with a south southeast wind 13 to 22 mph, with gusts as high as 37 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
Rain and thunderstorms before 3am, then a slight chance of rain. Some of the storms could produce heavy rainfall. Low around 47. Breezy, with a south wind 20 to 25 mph becoming west southwest after midnight. Winds could gust as high as 39 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Friday
Mostly cloudy, with a high near 50. Breezy, with a west wind 15 to 20 mph becoming north 8 to 13 mph in the afternoon. Winds could gust as high as 29 mph.
Friday Night
A 30 percent chance of rain after midnight. Mostly cloudy, with a low around 35. Northeast wind around 7 mph.
Saturday
A 40 percent chance of rain before noon. Partly sunny, with a high near 42. Breezy, with a west wind 7 to 12 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 28 mph.
Saturday Night
Mostly cloudy, with a low around 21. Blustery, with a west wind 16 to 21 mph, with gusts as high as 28 mph.
Sunday
Partly sunny, with a high near 31. Blustery.
Sunday Night
Mostly clear, with a low around 22.
Monday
Sunny, with a high near 42.
Monday Night
Mostly clear, with a low around 31.
Tuesday
Partly sunny, with a high near 48.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
Mostly cloudy, with a high near 38.
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ABOUT THIS FORECAST

 
Point Forecast:
Decatur Airport IL
 39.84°N 88.88°W (Elev. 650 ft)
Last Update:
1:51 am CST Jan 8, 2026
Forecast Valid:
2am CST Jan 8, 2026-6pm CST Jan 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation